Automatic weigher for cement



1952 H. w. CARLSEN 2,607,556

AUTOMATIC WEIGHER FOR CEMENT Filed March 28, 1949 In rehflh an Ca r/seh iffy Patented Aug. 19, 1952 OFFICE 2,607,556 AUTOMATICVWEIGHER FOR CEMENT Helmuth William Carlsen, Limhamn, Sweden Application March 28, 1949, Serial No; 83,872 In Sweden March 30, 1948 1 Claim.

This invention relates to portioning-out means particularly intended for use on building sites to portion out pulverized or granular materials such as cement, lime, and the like. By the use of suitable means for this purpose it will no longer be necessary, in the cement-works, to pack the cement inthe relatively small standard bags or barrels, that are now customary, and so obtain a considerable saving of packaging material. As it becomes more and more usual to weigh out the raw materials before the concrete is mixed, on account of the present high demands on the concrete quality, such suitable means may be considered to supply a long-felt want.

The principal object of my invention is to provide a machine comprising a discharging device for a container combined with a weighing machine which is adapted automatically to stop the discharge from said container when a certain amount by weight has been deposited onto the weighing machine.

The invention will be elucidated more in detail in the following, reference being had to the accompanying drawing, in .Which Fig. l is a side View of the machine, and

Fig. 2 is a section on line 22 in Fig. 1.

Referring to the drawing, a hopper I is mounted at the bottom of a container 20 for cement and is provided with a discharge tube in the form of a short hose 2 of rubber or other resilient material, and an agitator 3 which is mounted in the hopper and has a handle 4 .by means of which it can be oscillated within the hopper to facilitate the discharge of the cement. On the outer side of the hopper an abutment plate I6 having an exchangeable lining I of wood or rubber is fixed along one side of the hose 2, and opposite the said plate a tilting bar II is so mounted on the hopper as to swing around a pin I3 in a vertical plane through the axis of the hose. One end of the tilting bar II is fork-shaped and carries a horizontal roller I4. If the tilting bar is swung counterclockwise as viewed in Fig. 1, said roller I4 presses the hose against the abutment I5, I6, thus closing the hopper. The other arm of the tilting bar is loaded with a weight I2 tending always to swing the bar in the above-mentioned manner. Furthermore, the tilting bar may be provided with a hand lever I! so as to enable convenient swinging thereof by hand.

A releasing bar having the form of a doublearmed lever B is pivotally mounted on a stationary bracket ill. The one upwardly directed arm of this lever, which carries a roller I 0, is adapted to hold the loaded arm of the tilting bar I I lifted so that the outlet of the hopper is open. The loaded arm of the tilting bar I I thereby rests with its end on a roller I0 so that the arm falls down if the roller is swung aside. In order to move aside the roller when the tilting bar II is to be put up in opening position said arm is provided with an inclined surface I8. The other arm of the releasing bar is directed obliquely downwards, so that due to its proper weight said bar tends to engage under the tilting bar II, and bears against an abutment I fixed to a scale beam 8. This beam is supported by a pair of knife edges and is provided at one end with a weight 6 adjustable alon the beam, while the other end thereof carries a platform in the form of a grid suitable for receiving a bucket 5 of a certain size. The weighing machine is so located that the bucket on the platform is directly below the outlet of the hopper and the hose 2, and the abutment I is so arranged that when the bucket outbalances the weight 6 and swings the scale beam 8, it causes the releasing bar 9 to release the tilting bar, so that the latter closes the outlet on account of its load :by pressin the hose 2 fiat.

By means of the above described machine it is )OSSlblG rapidly to portion out desired amounts 1y Weight of pulverized or granular material with rather great exactitude by simple manipulations, whereby concrete mixtures of any desired composition, irrespective of the size of the mixer, can be obtained conveniently and rationally on the site.

Of course, the invention should not be considered as limited exactly to the embodiment shown, since it can be modified to a certain extent as to the construction of the details within the scope of the annexed claim.

What I claim and desire to secure by Letters Patent is:

A machine for portioning out predetermined amounts by weight of cement comprising in combination a container, a hopper mounted in the bottom thereof, a discharge tube of resilient material forming the outlet of said hopper, an abutment plate mounted on said hopper and extending along one side of said discharge tube, a tilting bar pivoted on the hopper and movable in a vertical plane through the axis of said discharge tube, said tilting bar having a depending offset arm thereon, a roller on the end of said arm contactable with said outlet tube, a weight loading said tilting bar and tending to press said outlet tube flat against said abutment through said arm and said roller, a bracket stationary with respect to said hopper, a releasing bar pivoted on said bracket, said releasing bar being movable in a vertical plane and so balanced as to be held by its weight with respect to its pivot axis in a position supporting said tilting bar in opening position against a force generated by the pressure of said tilting bar and acting in the releasing direction, a roller on the end of said releasing bar contactable with said tilting bar, a scale beam having an adjustable weight on one end, a receptacle on the opposite end thereof situated directly below the discharge tube to receive the material discharged therefrom, an abutment on and an inclined end surface on said tilting bar for moving aside said roller on said releasing bar when returning said tilting bar to opening position of said discharge tube.

HELMUTH VJILLIAM CARLSE-N.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 984,537 Buschman Feb. 21, 1911 1,368,778 Zanone Feb. 15, 1921 2,089,526 Andreas Aug. 10, 1937 2,113,022 Hefti Apr. 5, 1938 2,348,492 Miller May 9, 1944 

